Retail

Ford develops mobile aeroacoustic wind tunnel

Ford is taking wind-tunnel testing on the road, so that its engineers and the vehicles they test can spend less time traveling around the country.

GM sales drop 3.5% as rental sales slide; retail deliveries rise 12th straight month

GM's April sales fell 3.5 percent, amid another big drop in deliveries to rental companies. GM sold 259,557 vehicles last month. Its retail sales

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